Study on the influence of water flow on temperature around freeze pipes and its distribution optimization during artificial ground freezing

Huang, Shibing; Guo, Yifan; Liu, Yanzhang; Lu, Ke; Li, Guofeng; Chen, Cheng

doi:10.1016/j.applthermaleng.2018.02.090

Cited by 73 publications

(22 citation statements)

References 32 publications

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“…e thermal conductivity K refers to the heat passing through the unit area soil per unit time under the unit gradient. e thermal conductivity inside the porous media by the volume weighted average method [7,22,23] is…”

Section: The Coupled Hydrothermal Modelmentioning

confidence: 99%

“…Water seepage in porous media is assumed to satisfy Darcy's law. And the rate of water seepage V → in porous media is [21][22][23]…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…where κ ⟶ � κ s 0 0 κ s is the intrinsic permeability matrix, in which κ s is the permeability of saturated porous media before freezing; p l is the water pressure; and g ⟶ is the gravity acceleration vector. η is the viscosity of liquid water which could be expressed as a function of freezing temperature [22,23]:…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…κ r is the relative permeability which could be expressed as a function of water saturation S l [12,22,23]:…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…Lin et al [21] addressed the difficult closure of a frozen wall in a coal Mine shaft due to excessive seepage velocity in an aquifer when the aquifer is penetrated via the artificial freezing method. Huang et al [22][23][24] developed a hydrothermal coupling model to simulate the influence of water flow on the freezing process by considering the water/ice phase transition and combined the model with the Nelder-Mead simplex method based on the COMSOL Multiphysics platform. e position of the freezing pipes around the circular tunnel was optimized.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Wang

Rong

Lin

et al. 2019

Advances in Materials Science and Engineering

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Taking into account moisture migration and heat change during the soil freezing process, as well as the influence of absolute porosity reduction on seepage during the freezing process, we construct a numerical model of hydrothermal coupling using laws of conservation of energy and mass. The model is verified by the results of large-scale laboratory tests. By applying the numerical calculation model to the formation of artificial shaft freezing temperature fields under the action of large-flow groundwater, we conclude that groundwater with flow rates of less than 5 m/d will not have a significant impact on the artificial freezing temperature field. The maximum flow rates that can be handled by single-row freezing pipes and double-row freezing pipes are 10 m/d and 20 m/d, respectively, during the process of freezing shaft sinking. By analyzing the variation of groundwater flow rate during freezing process, we find that the groundwater flow velocity can reach 5–7 times the initial flow velocity near the closure moment of the frozen wall. Finally, in light of the action characteristics of groundwater on the freezing temperature field, we make suggestions for optimal pipe and row spacing in freezing pipe arrangement.

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Section: The Coupled Hydrothermal Modelmentioning

confidence: 99%

“…Water seepage in porous media is assumed to satisfy Darcy's law. And the rate of water seepage V → in porous media is [21][22][23]…”

Section: Water Flow Field Equationmentioning

confidence: 99%

Section: Water Flow Field Equationmentioning

confidence: 99%

“…κ r is the relative permeability which could be expressed as a function of water saturation S l [12,22,23]:…”

Section: Water Flow Field Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Wang

Rong

Lin

et al. 2019

Advances in Materials Science and Engineering

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Detection of the freezing state and frozen section thickness of fine sand by ultrasonic testing

Zhang

Murton

Liu

et al. 2020

Permafrost & Periglacial

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Determining the freezing state and frozen section thickness is fundamental to assessing the development of artificial frozen walls but is commonly difficult or inaccurate because of a limited number and fixed position of thermometer holes under complex field conditions. We report a novel experimental design that measures soil temperature, water content, and ultrasonic properties to monitor movement of the cryofront (0°C isotherm), water migration, and acoustic parameters during progressive upward freezing of fine sand under laboratory conditions. Ultrasonic testing during different stages of freezing revealed changes in three acoustic parameters (wave velocity, wave amplitude, and frequency spectrum). As the cryofront ascended through the sand at different water contents, wave velocity continually increased, whereas wave amplitude initially decreased and then increased. Wave velocity measurements revealed the cryofront position during freezing, but measurements of wave amplitude did not. The frequency components indicated the frequency of different evolving freezing regions during upward freezing and the freezing state of fine sand during later stages of freezing. The freezing state can be evaluated on the basis of single vs multiple peaks and the kurtosis of frequency spectrum change. An equation developed to predict the thickness of the frozen section and tested against measured values in the laboratory and field showed accuracies of 86.84–99.33%. The equation is used successfully to estimate frozen wall thickness in artificially frozen fine sand in Guangzhou, China.

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Modeling thermal conductivity of soils during a freezing process

Wan

Yan

et al. 2021

Heat Mass Transfer

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Study on the influence of water flow on temperature around freeze pipes and its distribution optimization during artificial ground freezing

Cited by 73 publications

References 32 publications

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Detection of the freezing state and frozen section thickness of fine sand by ultrasonic testing

Modeling thermal conductivity of soils during a freezing process

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